Optical fiber
CA 2336941 A1 · Owner: Tanaka, Shigeru · Inventors: Sasaoka, Eisuke; Tanaka, Shigeru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical fiber having at least a structure for effectively suppressing the increase of microbend loss, preferable to dispersion-flattened optical fiber dispersion-compensated optical fiber, and so forth and adapted to compensate , the single mode in the wavelength band used. Particularly the optical fiber , has a diameter of 140 µm or more and consequently has a high rigidity. Since the increase of the microbend loss is effectively suppressed and the fiber diameter is below 200 µm, the probability of rupture due to bending strain does not practically bring up any problem. The optical fiber has a larger mode field diameter, so that the optical energy density per unit cross section is …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed July 7, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 7, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.